AMD Radeon RX 6650M XT vs NVIDIA A100 PCIe 40 GB Comparison

FAQ

Q: Which GPU has the higher average benchmark score in the database?

A: The NVIDIA A100 PCIe 40 GB records an average benchmark score of 162,504, while the AMD Radeon RX 6650M XT records 76,904. The A100 sits at the 97th percentile among all GPUs, whereas the RX 6650M XT sits at the 91st percentile.

Q: In the Geekbench OpenCL test, how large is the performance gap?

A: The A100 scores 178,627 versus 76,904 for the RX 6650M XT, a 132.3% advantage. This is the only head-to-head benchmark recorded between the two.

Q: What are the memory configurations of these two cards?

A: The A100 uses 40 GB of HBM2e memory on a 5120-bit bus, delivering 1.56 TB/s bandwidth. The RX 6650M XT uses 8 GB of GDDR6 memory on a 128-bit bus, delivering 256.0 GB/s bandwidth.

Q: Which GPU has more shading units and tensor cores?

A: The A100 has 6,912 shading units and 432 tensor cores. The RX 6650M XT has 2,048 shading units and no tensor cores, but it does include 32 ray tracing cores.

Q: What are the power specifications listed in the database?

A: The A100 has a TDP of 250 W and uses an 8-pin EPS power connector with a suggested PSU of 600 W. The RX 6650M XT has a TDP of 120 W, uses no power connectors, and has no suggested PSU listed.

Q: Which GPU supports DirectX 12 Ultimate and Vulkan 1.4?

A: Only the RX 6650M XT has these API entries listed. The A100's database entry has null values for DirectX, OpenGL, and Vulkan.

Architecture Differences

The NVIDIA A100 PCIe 40 GB is built on the GA100 chip using the Ampere architecture, fabricated on a 7 nm TSMC process. It integrates 54,200 million transistors on a die size of 826 mm², resulting in a transistor density of 65.6M per mm². The chip belongs to the Server Ampere (Axx) generation and was released in 2020.

The AMD Radeon RX 6650M XT uses the Navi 23 chip with RDNA 2.0 architecture, also on a 7 nm TSMC process. It contains 11,060 million transistors on a 237 mm² die, giving a transistor density of 46.7M per mm². It is part of the Navi Mobile (RX 6000M) generation and was released in 2022.

The A100 is a server-oriented compute accelerator with no display outputs, while the RX 6650M XT is a mobile GPU with portable-device-dependent display outputs. The A100 supports PCIe 4.0 x16, whereas the RX 6650M XT uses PCIe 4.0 x8.

The A100's memory subsystem uses HBM2e with a 5120-bit bus width. The RX 6650M XT uses GDDR6 on a 128-bit bus. The A100 has 432 tensor cores dedicated to AI workloads; the RX 6650M XT has no tensor cores but includes 32 ray tracing cores for real-time ray tracing. The A100's FP16 throughput is listed at 77.97 TFLOPS (4:1), while the RX 6650M XT's FP16 is 19.79 TFLOPS (2:1).

Where Each One Wins

The A100 wins decisively in the only recorded head-to-head benchmark, Geekbench OpenCL. Its score of 178,627 is more than double the RX 6650M XT's 76,904. The A100 also holds the edge in raw compute resources: 6,912 shading units versus 2,048, 432 TMUs versus 128, and 160 ROPs versus 64. Its texture rate is 609.1 GTexel/s compared to 309.2 GTexel/s, and its pixel rate is 225.6 GPixel/s versus 154.6 GPixel/s.

The RX 6650M XT wins in areas of portability and power efficiency. Its TDP of 120 W is less than half the A100's 250 W, and it requires no external power connectors. It also supports modern graphics APIs including DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, while the A100's API fields are unlisted. The RX 6650M XT includes ray tracing cores, which the A100 lacks entirely.

For gaming-oriented tasks or mobile deployments, the RX 6650M XT offers a complete feature set in a compact, low-power package. For compute-heavy workloads such as AI training or scientific simulation, the A100's massive memory bandwidth and tensor core count make it the clear choice.

Specification Differences

The two GPUs differ in nearly every major specification category. The A100 has a base clock of 765 MHz and boost clock of 1410 MHz, while the RX 6650M XT runs at 2068 MHz base and 2416 MHz boost, with a game clock of 2162 MHz. Memory clock also differs: the A100's memory runs at 1215 MHz (2.4 Gbps effective), while the RX 6650M XT's memory runs at 2000 MHz (16 Gbps effective).

Memory capacity and type differ substantially: 40 GB HBM2e versus 8 GB GDDR6. Bus width is 5120-bit versus 128-bit, and bandwidth is 1.56 TB/s versus 256.0 GB/s. The A100 has 6,912 shading units, 432 TMUs, 160 ROPs, and 432 tensor cores. The RX 6650M XT has 2,048 shading units, 128 TMUs, 64 ROPs, and 32 ray tracing cores, but no tensor cores.

FP32 throughput is 19.49 TFLOPS for the A100 versus 9.896 TFLOPS for the RX 6650M XT. FP16 is 77.97 TFLOPS (4:1) versus 19.79 TFLOPS (2:1). The A100 has a dual-slot form factor and measures 267 mm in length and 111 mm in height, while the RX 6650M XT is listed as IGP with no dimensions. The A100 uses an 8-pin EPS connector, while the RX 6650M XT has no power connectors. The A100's suggested PSU is 600 W; the RX 6650M XT has none.

The A100's predecessor is Tesla Turing and its successor is Server Ada. The RX 6650M XT's predecessor is Polaris Mobile, with no successor listed.

Head-to-Head Benchmarks

The database records only one head-to-head benchmark between these two GPUs: Geekbench OpenCL. In that test, the NVIDIA A100 PCIe 40 GB scores 178,627, while the AMD Radeon RX 6650M XT scores 76,904. The delta is 132.3% in favor of the A100.

This is a substantial margin. The A100's score places it among the top tier of all GPUs at the 97th percentile, and its nearest rivals in the database are the AMD Radeon Pro W6800X (average score 160,671, delta 1.1%), the AMD Radeon PRO W7800 (164,894, delta -1.4%), the NVIDIA RTX A5500 (165,217, delta -1.6%), and the NVIDIA RTX 4500 Ada Generation (166,094, delta -2.2%). The A100's average benchmark score of 162,504 sits above all four of these rivals.

The RX 6650M XT's average score of 76,904 places it at the 91st percentile. Its nearest rivals are the NVIDIA GeForce RTX 5090 D (77,712, delta -1%), the AMD Radeon RX 6850M XT (78,940, delta -2.6%), the NVIDIA Tesla P100 PCIe 12 GB (79,396, delta -3.1%), and the NVIDIA Tesla P100 PCIe 16 GB (79,605, delta -3.4%). The RX 6650M XT trails each of these rivals by 1% to 3.4%.

The single benchmark result shows a clear and overwhelming performance gap. The A100's OpenCL score is more than double the RX 6650M XT's, reflecting its larger memory subsystem, higher shading unit count, and tensor core acceleration. No benchmark favors the RX 6650M XT in the recorded data.

The Verdict

The data points to a straightforward conclusion: the NVIDIA A100 PCIe 40 GB is the far more powerful GPU in raw compute performance. Its Geekbench OpenCL score of 178,627 is 132.3% higher than the RX 6650M XT's 76,904, and its average benchmark score of 162,504 places it at the 97th percentile of all GPUs, compared to the 91st percentile for the RX 6650M XT.

The A100 is designed for server and datacenter workloads. Its 40 GB HBM2e memory with 1.56 TB/s bandwidth, 432 tensor cores, and 19.49 TFLOPS FP32 throughput make it suitable for AI inference, training, and high-performance computing tasks. Its lack of display outputs and absence of listed graphics APIs confirm its compute-first orientation.

The RX 6650M XT is a mobile GPU with a different purpose. It draws 120 W versus 250 W, requires no external power connectors, and includes ray tracing cores plus full graphics API support. Its 8 GB GDDR6 memory and 256.0 GB/s bandwidth are modest compared to the A100, but they serve gaming and portable workloads well.

For anyone needing maximum compute throughput, the A100 is the only choice from this comparison. For anyone needing a low-power mobile GPU with modern graphics features, the RX 6650M XT is the appropriate pick. The benchmark data does not show any scenario where the RX 6650M XT outperforms the A100; the A100 wins the sole recorded test outright.